The memo was issued based on “information of a potential large scale protest in the Central Business District.”

Pittsburgh police detectives will report for duty with riot gear Thursday, in anticipation of a potential large scale protest should President Trump decide to fire Special Counsel Robert Mueller.

Major Crimes Commander Victor Joseph instructed his unit to bring "a full uniform and any issued protective equipment (riot gear) with them to work until further notice," WPXI.com reported.

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Special Counsel Robert Mueller departs after a briefing on June 21, 2017. (Joshua Roberts/REUTERS)

The memo was issued based on "information of a potential large scale protest in the Central Business District."

Riot police stand in a street during a demonstration against the G20 economic summit in Pittsburgh, Pennsylvania. (SAUL LOEB/AFP/Getty Images)

"There is a belief that President Trump will soon move to fire Special Prosecutor Mueller. This would result in a large protest within 24 hours of the firing. The protest would be semi-spontaneous and more than likely happen on short notice," the missive read.

Senate Majority Leader Mitch McConnell blocked bipartisan legislation that would make it harder for Trump to fire Mueller, calling it unnecessary because he doesn't believe Trump will axe Mueller, who is investigating possible collusion between Russia and the Trump campaign.